Darien, Thank you for posting this guide from IBI.Step It Up Belchertown, and PVBI have been using IBI guides, IBI Quick Tests as basis for Biochar Evaluation and field trials.Last year NESFI incorporated Biochar ( Connecticut Charcoal , Union CT ) into a field study after doing the required MassDEP analysis and recieve their blessing. Adam Dole ( NESFI ) can fill you in on the details.I have done similar in my garden using "campfire charcoal" for the past 3 years.

Maybe it would be helpful to enter our data and findings into the IBI Field Trial Registry,....and collect and retain valuable information befor it gets lost.